Recording device and optical oscillator device

Abstract

A recording device that records information in an optical recording medium includes: a self excited oscillation semiconductor laser including a saturable absorber section to apply a bias voltage and a gain section to inject a gain current, and also emitting a laser light to record the information in the optical recording medium; a reference signal generation unit generating a master clock signal and also supplying an injection signal synchronized with the master clock signal to the gain section of the self excited oscillation semiconductor laser; and a recording signal generation unit generating a recording signal based upon the master clock signal and also applying the recording signal to the saturable absorber section of the self excited oscillation semiconductor laser as the bias voltage.

What is claimed is: 
     
       1. A recording device recording information in an optical recording medium, the recording device comprising:
 a self excited oscillation semiconductor laser including a saturable absorber section to apply a bias voltage and a gain section to inject a gain current, and also emitting a laser light to record the information in the optical recording medium; 
 a reference signal generation unit generating a master clock signal and also supplying an injection signal synchronized with the master clock signal to the gain section of the self excited oscillation semiconductor laser; and 
 a recording signal generation unit generating a recording signal based upon the master clock signal and also applying the recording signal to the saturable absorber section of the self excited oscillation semiconductor laser as the bias voltage. 
 
     
     
       2. The recording device according to  claim 1 , wherein a signal obtained from wobble formed in a groove of the optical recording medium is supplied to the recording signal generation unit. 
     
     
       3. The recording device according to  claim 1 , wherein the self excited oscillation semiconductor laser has a double quantum well separate confinement heterostructure with a GaInN/GaN/AlGaN material. 
     
     
       4. The recording device according to  claim 3 , wherein the bias voltage is a negative value, and the bias voltage in a non-oscillation period of the self excited oscillation semiconductor laser is greater in a negative direction than the bias voltage in an oscillation period of the self excited oscillation semiconductor laser. 
     
     
       5. An optical oscillator device, comprising:
 a self excited oscillation semiconductor laser including a saturable absorber section applying a bias voltage and a gain section injecting a gain current, and also emitting a laser light; 
 a reference signal generation unit generating a master clock signal and also supplying an injection signal synchronized with the master clock signal to the gain section of the self excited oscillation semiconductor laser; and 
 an emission signal generation unit generating a predetermined signal based upon the master clock signal, and also applying the predetermined signal to the saturable absorber section of the self excited oscillation semiconductor laser as the bias voltage.